What factor most likely led to the abandonment of Chaco Canyon?

Name: What factor most likely led to the abandonment of Chaco Canyon?
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The most accepted theory among archaeologists is that a series of droughts, combined with overuse of resources, led to the decline and eventual abandonment of Chaco Canyon. The Ancestral Puebloans who lived there were heavily dependent on agriculture, and the prolonged droughts made it difficult to sustain their population.

What Factor Most Likely Led to the Abandonment of Chaco